Fix: unnecessary import causing errors

plugins/eFlows_menu_link.py

 from airflow.plugins_manager import AirflowPlugin
-from flask_admin.base import MenuLink
 
 appbuilder_eFlows = {
-    "name": "More about eFlows4HPC",
+    "name": "About eFlows4HPC",
     "href": "https://eflows4hpc.eu/",
 }
 
@@ -12,4 +11,4 @@ class AirflowEFlowsPlugin(AirflowPlugin):
     flask_blueprints = []
     hooks = []
     admin_views = []
-    appbuilder_menu_items = [appbuilder_eFlows]
\ No newline at end of file
+    appbuilder_menu_items = [appbuilder_eFlows]